The golden toad is pretty gorgeous. Too bad you'll never see one in person. They went extinct in 1989:

Scientists aren't totally sure what led to this Costa Rican toad's decline, but the best theory is that the El Nino weather pattern along with global warming and airborne pollution dried up pools and ponds the toad lived in.

BuzzFeed has 16 other animals that have died during our lifetimes -and yes, even if you're really young, most of these will still have died during your lifetime.